648858889 has 4 divisors (see below), whose sum is σ = 741553024. Its totient is φ = 556164756.

The previous prime is 648858871. The next prime is 648858901. The reversal of 648858889 is 988858846.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 648858889 - 2⁷ = 648858761 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 648858889.

It is not an unprimeable number, because it can be changed into a prime (648858289) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46347057 + ... + 46347070.

It is an arithmetic number, because the mean of its divisors is an integer number (185388256).

Almost surely, 2^648858889 is an apocalyptic number.

It is an amenable number.

648858889 is a deficient number, since it is larger than the sum of its proper divisors (92694135).

648858889 is an equidigital number, since it uses as much as digits as its factorization.

648858889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92694134.

The product of its digits is 35389440, while the sum is 64.

The square root of 648858889 is about 25472.7087095189. The cubic root of 648858889 is about 865.7318981730.

The spelling of 648858889 in words is "six hundred forty-eight million, eight hundred fifty-eight thousand, eight hundred eighty-nine".